Audio amplifier



FIG. 1 is a perspective view of the front, top and left side of an audio amplifier showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirror image of the right side view;

FIG. 5 is a top plan view thereof, the bottom plan view being identical to the top plan view; and,

FIG. 6 is a perspective view of the rear, top and right side thereof.

The broken line disclosure in the views forms no part of the claimed design. 

CLAIM The ornamental design for an audio amplifier, as shown and described. 